Lining of pipes



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RoDrawing'. Application filed 1 11115,

To all wlzomz't may co n-cemi:

, mixture Be it known that I, Bn'NJAinNYlAmor,

a "subject of the King of Great Britain, residing in Northallerton, England, have invented certain new and useful Improvements in the Lining of'Pipes, of which the" following is a specification. v The'present invention relatesto the lining of metal pipes by centrifugal action with tar, pitch, bitumen or other hydrocarbons which are solid at ordinary-temperatures, to protect them from rust, and soincrease their len th of time in service. f 1

'- he principle of lining pipes bymeans of centrlfugal action and also the makingof concrete or cement pipes on the same principle is well-known; andl'it has. also-been previously propbsed to line concrete or cement pipes with bitumen. j In the lining of metal pipes'in this manner with hydrocarbons as mentioned above it is not feasible for various reasons to have a lining of the desired thickness of the pure material used, whilst on the other hand, in many cases it is desirable that the surface at any rate of the lining should be of pure material.

To attain this result, instead of using the pure hydrocarbon or the like, solid at ordinary temperatures, I mix with it a largeproportion of reinforcing material, such as granite chips, barytes or other suitable ma-. terial, ground to a sufiiciently fine state. This mixture is heated so that the pitch or other hydrocarbon-is in a fluid-state and applied to the interior of the pipe to be lined by means of centrifugal action, and for the purpose of keeping the hydrocarbon liquid whilst the lining is being spun, '1, heat the interior of the pipe to a sufficient temperature when'neoessary, I introduce the mixture preferably b mechanical means through a heated trou h i or otherwise, which spreads itnover' t e length of the pipe, between the limits of the 1 retaining rings usually provided at the two ends, and the centrifugal action results inthe mixture being spread uniformly over the interior of the pipe and also has a further result that the ground granite or similar v powdery reenforcing material owing toits greater specific gravity are forced to the outer surface of the lining, that is to say, the face of the lining next to the pipe, and

are bound together by the h drocarbons.

By revolving the pipe at a su cient speed,

neutralize and saponi by :weight of. fine 1924.- Serial N0. .724,538.

the particles of reenforcing material are I forced by centrifugal action toward the wall of the pipe, leaving on the-exposed face of the lining a comparatively pure hydrocarbon surface. ubstantially free from reenforcing material;- Of the desired thickness and of smoothand practically pure hydrocarbon exposed surface is obtained at a considerably lower cost .In this manner a lining,

temperature whilst the pioe'is still revolv- I ing, so that the inner exposed surface of hydrocarbon becomes sufficiently solid not to 'run when the centrifugal action ceases, and

--1s of an even glossy surface, which is so desirable f the flow. of water or other liquids. To effect-this cooling of the lining it may be convenient to spray the outside of the steel pipe, when such is used, by means of water, preferably applied fairly equally by jets along its entire length, or the cooling may be effected by means of air drawn or forced through the interior of the pipe. I a I have found that-the hydrocarbon mix 7 ture can be varied within quite wide, limits to suit the pipe to be lined; For the majority of steel pipes I have found a mixture of. bitumen, pitch. and anthracene oil to givegood results when intimately mixed with the reinforcing material. A small percentage of rosin, lime, sulphur, .resin, etc, may ad vantageously be added,tl1e lime tending to cut the effect of'the addition of sulphur is to render the lining tougher nd more.

flexible, so that, for example, if t e hydrocarbon is a bitumen of low melting point the addition ofsulphur raises the melting point and at the same time gives a product of greater flexibility than is usual with bitumen ofrhigher melting point.

A suitable proportion between hydrocarbon mixture and reinforcing -material may be given as follows to parts granite chippings, 35 to 25, parts by weight of hydrocarbon mixture. The granitev chippings' should of such fineness that they wi sieve, but the degree of fineness may vary considerably, de ending mainly on the thickness 'ofthe ining required, which in fy any tar acids pres-' preferably be 3 1 pass a turn depends upon the depth of the retaining or'determination rings usually provided at the ends of the tube.

I sometimes find it advantageous also to introduce the hydrocarbon mixture in more than one addition, the first or subsequent lot, mixedw'ith the chippings, being of a softer quality than the last lot for the final face, which latter may be quite thin and composed'largel of bitumen.

Having thus fillly described the nature of the said invention and the best means I know for carrying the same into practical effect, I claim A 1. A process of lining metal pipes, which consists in feeding a mixture of a hydrocarbon material and a powdery reinforcing material into the pipe to be lined and then rapidly rotating the pipe about its longitudinal axis at a temperature at which the hydrocarbon material is fluid and continuing the rotation with reduction of temperature until the lining is sufficiently set.

2. A process of lining metal pipes, which consists in feeding a mixture of a hydrocarbon material and a powdery reinforcing material into the pipe to be lined, rotating the pipe about its longitudinal axis at a temperature at which the hydrocarbon material is fluid and at a speed tending to segregate the reinforcing material by the action of centrifugal force until the exposed surface of the lining is comparatively pure hydrocarbon material and has a smooth and glossy surface.

3. A process of lining metal pipes, which consists in feeding a fluid mixture of a hydrocarbon material and a powdery reinforcing material into the pipe to be lined and rapidly rotating the pipe about its longitudinal axis and continuing the rotation with reduction of temperature until the lining is sufficiently set.

4. A process of lining metal pipes, which consists in heating a mixture of a hydrocarbon material and a powdery reinforcing ,material to a temperature 'at which the hydrocar'bon material 'is fluid, feeding the heated mixture into the pi e to be lined,

rapidly rotating the pipe a out its lon tudinal axis untll the exposed surface of t e lining is smooth and comparatively free lining has set.

until the lininghas set. i

5. A process of lining metal pipes, 'which consists in introducing into-the pipe an ap propriate quantity ofa mixture of a hydrocarbon material and a powdery reinforcing material, heating the. pip and rapidly r0-.

tating it about its longitudinal axis until the exposed surface of the lining is smooth and glossy and comparatively free from the reinforcing material, and then cooling the pipe and continuing the rotation until the 6. A process oflining metal pipes, which consists in making a fluid mixture of a hydrocarbon material with a powdery reinforcing material and a. small percentage of sulphur, feeding this mixture into the pipe to be lined, rapidly rotating the pipe about its longitudinal axis to distribute the mixtureto a uniform thickness over its interior surface and continuing the-rotation with re duction of temperature until the lining is sufficiently set. P j

7. A process of lining metal pipes, which consists in feeding. into the pipe to be lined a mixture of a siliceous material ground to a fine condition and a hydrocarbon material composed ofbitumen and anthracene'. 011,

drocarbon material is fluid, and continumg the rotation withreduction of temperature.

8. A process of lining metalp'ipes, whlch consists in introducing a fluid mixture of a hydrocarbonmaterial and a powdery remforcing material into the pipe to :be lined and then rotating the pipe about its longitudinal axis to form the lining by centrifugal action, the material being introducedin a plurality of stages, that used 1n the earlier stages having a larger proportion of powdery reinforcing material, while that introduced to the last stage to form the exposed surface is composed largely of hydro-. carbon material.

In testimony whereof I have signed my name to this specification.

. BE JAMm TALBOT. 

